1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
4  */
5 
6 #include <linux/component.h>
7 #include <linux/module.h>
8 #include <linux/of_device.h>
9 #include <linux/platform_device.h>
10 
11 #include <drm/drm_crtc_helper.h>
12 #include <drm/drm_of.h>
13 #include <drm/drm_simple_kms_helper.h>
14 
15 #include "sun8i_dw_hdmi.h"
16 #include "sun8i_tcon_top.h"
17 
18 static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
19 					   struct drm_display_mode *mode,
20 					   struct drm_display_mode *adj_mode)
21 {
22 	struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
23 
24 	clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
25 }
26 
27 static const struct drm_encoder_helper_funcs
28 sun8i_dw_hdmi_encoder_helper_funcs = {
29 	.mode_set = sun8i_dw_hdmi_encoder_mode_set,
30 };
31 
32 static enum drm_mode_status
33 sun8i_dw_hdmi_mode_valid_a83t(struct dw_hdmi *hdmi, void *data,
34 			      const struct drm_display_info *info,
35 			      const struct drm_display_mode *mode)
36 {
37 	if (mode->clock > 297000)
38 		return MODE_CLOCK_HIGH;
39 
40 	return MODE_OK;
41 }
42 
43 static enum drm_mode_status
44 sun8i_dw_hdmi_mode_valid_h6(struct dw_hdmi *hdmi, void *data,
45 			    const struct drm_display_info *info,
46 			    const struct drm_display_mode *mode)
47 {
48 	/*
49 	 * Controller support maximum of 594 MHz, which correlates to
50 	 * 4K@60Hz 4:4:4 or RGB.
51 	 */
52 	if (mode->clock > 594000)
53 		return MODE_CLOCK_HIGH;
54 
55 	return MODE_OK;
56 }
57 
58 static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
59 {
60 	return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
61 		!!of_match_node(sun8i_tcon_top_of_table, node);
62 }
63 
64 static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
65 					     struct device_node *node)
66 {
67 	struct device_node *port, *ep, *remote, *remote_port;
68 	u32 crtcs = 0;
69 
70 	remote = of_graph_get_remote_node(node, 0, -1);
71 	if (!remote)
72 		return 0;
73 
74 	if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
75 		port = of_graph_get_port_by_id(remote, 4);
76 		if (!port)
77 			goto crtcs_exit;
78 
79 		for_each_child_of_node(port, ep) {
80 			remote_port = of_graph_get_remote_port(ep);
81 			if (remote_port) {
82 				crtcs |= drm_of_crtc_port_mask(drm, remote_port);
83 				of_node_put(remote_port);
84 			}
85 		}
86 	} else {
87 		crtcs = drm_of_find_possible_crtcs(drm, node);
88 	}
89 
90 crtcs_exit:
91 	of_node_put(remote);
92 
93 	return crtcs;
94 }
95 
96 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
97 			      void *data)
98 {
99 	struct platform_device *pdev = to_platform_device(dev);
100 	struct dw_hdmi_plat_data *plat_data;
101 	struct drm_device *drm = data;
102 	struct device_node *phy_node;
103 	struct drm_encoder *encoder;
104 	struct sun8i_dw_hdmi *hdmi;
105 	int ret;
106 
107 	if (!pdev->dev.of_node)
108 		return -ENODEV;
109 
110 	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
111 	if (!hdmi)
112 		return -ENOMEM;
113 
114 	plat_data = &hdmi->plat_data;
115 	hdmi->dev = &pdev->dev;
116 	encoder = &hdmi->encoder;
117 
118 	hdmi->quirks = of_device_get_match_data(dev);
119 
120 	encoder->possible_crtcs =
121 		sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
122 	/*
123 	 * If we failed to find the CRTC(s) which this encoder is
124 	 * supposed to be connected to, it's because the CRTC has
125 	 * not been registered yet.  Defer probing, and hope that
126 	 * the required CRTC is added later.
127 	 */
128 	if (encoder->possible_crtcs == 0)
129 		return -EPROBE_DEFER;
130 
131 	hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
132 	if (IS_ERR(hdmi->rst_ctrl))
133 		return dev_err_probe(dev, PTR_ERR(hdmi->rst_ctrl),
134 				     "Could not get ctrl reset control\n");
135 
136 	hdmi->clk_tmds = devm_clk_get(dev, "tmds");
137 	if (IS_ERR(hdmi->clk_tmds))
138 		return dev_err_probe(dev, PTR_ERR(hdmi->clk_tmds),
139 				     "Couldn't get the tmds clock\n");
140 
141 	hdmi->regulator = devm_regulator_get(dev, "hvcc");
142 	if (IS_ERR(hdmi->regulator))
143 		return dev_err_probe(dev, PTR_ERR(hdmi->regulator),
144 				     "Couldn't get regulator\n");
145 
146 	ret = regulator_enable(hdmi->regulator);
147 	if (ret) {
148 		dev_err(dev, "Failed to enable regulator\n");
149 		return ret;
150 	}
151 
152 	ret = reset_control_deassert(hdmi->rst_ctrl);
153 	if (ret) {
154 		dev_err(dev, "Could not deassert ctrl reset control\n");
155 		goto err_disable_regulator;
156 	}
157 
158 	ret = clk_prepare_enable(hdmi->clk_tmds);
159 	if (ret) {
160 		dev_err(dev, "Could not enable tmds clock\n");
161 		goto err_assert_ctrl_reset;
162 	}
163 
164 	phy_node = of_parse_phandle(dev->of_node, "phys", 0);
165 	if (!phy_node) {
166 		dev_err(dev, "Can't found PHY phandle\n");
167 		ret = -EINVAL;
168 		goto err_disable_clk_tmds;
169 	}
170 
171 	ret = sun8i_hdmi_phy_get(hdmi, phy_node);
172 	of_node_put(phy_node);
173 	if (ret) {
174 		dev_err(dev, "Couldn't get the HDMI PHY\n");
175 		goto err_disable_clk_tmds;
176 	}
177 
178 	ret = sun8i_hdmi_phy_init(hdmi->phy);
179 	if (ret)
180 		goto err_disable_clk_tmds;
181 
182 	drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
183 	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
184 
185 	plat_data->mode_valid = hdmi->quirks->mode_valid;
186 	plat_data->use_drm_infoframe = hdmi->quirks->use_drm_infoframe;
187 	sun8i_hdmi_phy_set_ops(hdmi->phy, plat_data);
188 
189 	platform_set_drvdata(pdev, hdmi);
190 
191 	hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
192 
193 	/*
194 	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
195 	 * which would have called the encoder cleanup.  Do it manually.
196 	 */
197 	if (IS_ERR(hdmi->hdmi)) {
198 		ret = PTR_ERR(hdmi->hdmi);
199 		goto cleanup_encoder;
200 	}
201 
202 	return 0;
203 
204 cleanup_encoder:
205 	drm_encoder_cleanup(encoder);
206 err_disable_clk_tmds:
207 	clk_disable_unprepare(hdmi->clk_tmds);
208 err_assert_ctrl_reset:
209 	reset_control_assert(hdmi->rst_ctrl);
210 err_disable_regulator:
211 	regulator_disable(hdmi->regulator);
212 
213 	return ret;
214 }
215 
216 static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
217 				 void *data)
218 {
219 	struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
220 
221 	dw_hdmi_unbind(hdmi->hdmi);
222 	sun8i_hdmi_phy_deinit(hdmi->phy);
223 	clk_disable_unprepare(hdmi->clk_tmds);
224 	reset_control_assert(hdmi->rst_ctrl);
225 	regulator_disable(hdmi->regulator);
226 }
227 
228 static const struct component_ops sun8i_dw_hdmi_ops = {
229 	.bind	= sun8i_dw_hdmi_bind,
230 	.unbind	= sun8i_dw_hdmi_unbind,
231 };
232 
233 static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
234 {
235 	return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
236 }
237 
238 static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
239 {
240 	component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
241 
242 	return 0;
243 }
244 
245 static const struct sun8i_dw_hdmi_quirks sun8i_a83t_quirks = {
246 	.mode_valid = sun8i_dw_hdmi_mode_valid_a83t,
247 };
248 
249 static const struct sun8i_dw_hdmi_quirks sun50i_h6_quirks = {
250 	.mode_valid = sun8i_dw_hdmi_mode_valid_h6,
251 	.use_drm_infoframe = true,
252 };
253 
254 static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
255 	{
256 		.compatible = "allwinner,sun8i-a83t-dw-hdmi",
257 		.data = &sun8i_a83t_quirks,
258 	},
259 	{
260 		.compatible = "allwinner,sun50i-h6-dw-hdmi",
261 		.data = &sun50i_h6_quirks,
262 	},
263 	{ /* sentinel */ },
264 };
265 MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
266 
267 static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
268 	.probe  = sun8i_dw_hdmi_probe,
269 	.remove = sun8i_dw_hdmi_remove,
270 	.driver = {
271 		.name = "sun8i-dw-hdmi",
272 		.of_match_table = sun8i_dw_hdmi_dt_ids,
273 	},
274 };
275 
276 static int __init sun8i_dw_hdmi_init(void)
277 {
278 	int ret;
279 
280 	ret = platform_driver_register(&sun8i_dw_hdmi_pltfm_driver);
281 	if (ret)
282 		return ret;
283 
284 	ret = platform_driver_register(&sun8i_hdmi_phy_driver);
285 	if (ret) {
286 		platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
287 		return ret;
288 	}
289 
290 	return ret;
291 }
292 
293 static void __exit sun8i_dw_hdmi_exit(void)
294 {
295 	platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
296 	platform_driver_unregister(&sun8i_hdmi_phy_driver);
297 }
298 
299 module_init(sun8i_dw_hdmi_init);
300 module_exit(sun8i_dw_hdmi_exit);
301 
302 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
303 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
304 MODULE_LICENSE("GPL");
305